2024 11 06

# def f():

# b=0

# global n

# global m

# global a

# if a>=max(m):

# return n+1

#

# for i in range(n):

# if a<m[i]:

# return i+1

#

# n=int(input())

# m=list(map(int,input().split()))

# a=int(input())

# print(f())

def f():

global n

global m

global a

for i in range(n):

if a==m[i]:

return i+1

return -1

n=int(input())

m=list(map(int,input().split()))

a=int(input())

#print(m, n, a)

print(f())